const fn = () => {
    let arr = [1, 2, 2, 4, 3, 4, 1, 3, 2, 7, 5, 6]
    let newArr = []
    arr.forEach((val) => {
        if (newArr.indexOf(val) == -1) {
            newArr.push(val)
        }
    })
    return newArr
}
export default fn